Smoke-consuming furnace



UNITED STATES- fPA'rENT OFFICE..

crnus SMITH, or InwIN S STATION, PENNSYLVANIA.

`slsnoKE-ConsuMlNc; FURNACE.

SPECIFICATION forming part of Letters Patent No. 237,081, dated January25, 1881.

Application filed May 6, 1880.

To all whom it `may concern: i

Be it known that L'CYRUS SMITH, of Irwins Station, in the county ofWestmoreland and `State of Pennsylvania, have `invente'd-a new anduseful Improvement in Smoke-Consuming Furnaces for Boilers, of which thefollowing is a specification.

The object of this invention is to provide a furnace and auxiliaryapparatus' forboilers, whereby .the unconsumed products of .combustionevolved from the iire shall be arrested and returned to the iire forcomplete combus- I. tion, so as to utilizeiall the fuel and theA heat itis capable of producing. l

The invention is an .improvementon the improvement in smoke-consumingfurnaces for which Letters Patent were issued to me February 4, 1879 5and it consists of a boilerfurnace of novelconstruction, and, incombination therewith of'a peculiarly-constructed exhaust-fan,gas andairy mixing. chamber, devices for facilitatingthe removalof ashes, andother improved devices, all of which are hereinafter fully described.

Figure 1 is a frontelevation of the device. Fig.2 is a sectional sideelevation of the same on line fr, Fig. 1. Fig. 3 is-a sectionalelevation'on line y y, Fig, 2. Fig. 4 is a crosssection on line z z,Fig. 2.

Similar letters Vof reference indicate corresponding parts. f I

ln the drawings, A represents the boiler, 3 the fire-placaand C the iiuebeneath the boiler, connecting, through the boiler-hues, with thesmoke-stack AVD.

E represents the ash-pit, provided with twodoors,EE,thatareprovidedwithinward-sloping anges ma, that are vseparateor disunited from each other at thecorners of the doors, sof

that'when the saiddoors are forced in or closed the elasticity of saidIianges will hold thedoors smoke and dust tight. The ashpit E is dividedinto two chambers by the partition F, thatextends from the frontrearward` to the bridge-wall, and the lower sec- .tion,ib, ofsaidfpartition F is immovable, and

acts as a stopfor theupper section, c, which isl adjusted by the rod G.The right-hand chamber, E", of the ash-pit E communicates withatransverse covered passage-way in rear of the bridge-wall H byv meansof an opening, d, through saidbridge-wall H',

I is a rectangular boxor chamber built up (MOdeI.)

vthe chamber I from front to rear thereof, are

fixed at right angles to each other two cut- `oii's or dampers, K', bymeans of which the forced blast into the two separate chambers of theash-pit Eis controlled, the passage into one of said chambers beingclosed while the other is opened.

Above the boiler A is fixed the fan-blower L, within whose cylindricalshell or casing the fan L' revolves on the fan-shaft L". This shaft Llhas its bearings outside of the fanshell, on the pillow-blocks ff, asshown, and extends far enough within said shell to carry on its ends thesleeve M, being connected therewith by spiders g g. This sleeve M is ofthe same diameter as the rear central spring, h, of the fan-shell, andto its front end is attached, by means of lugs Il i, a circular plate,M,which covers said end of the sleeve M, so 'as to leave but severalnarrow slits or spaces, 7c la, between the end of the said sleeve M andplate or cover M', these openings k la being designed for the admissionof cold air Ainto the fan-case through the said sleeve M, for thepurpose of keeping the shaft L and its bearings cool, or from becomingheated from th'fanfcase, which latter gets quite hot when the device isin operation.

The wings l l ofthe fan are two or more in number, andl extend radiallyfrom the sleeve IM. The peripheral faces or edges of the said wings l lare of the same depth as the sleeve M, and the front edges of said wingsare cut away from about their central points in a curve to their innerends, Where they are attached-to the sleeve M, in order to permit a freeadmission of air into the fan-case. These wings l l are strengthened andsupported in the direction of their revolution by the braces m m, thatextend'from the face of one wing l'to the back of another throughout thewhole IOO and said braces m m being secured to said wings Z land sleeveM, so as to slope or incline upward and rearward to the same plane asthe rear end of the sleeve M, thereby giving to the said fan a shape oroutline best adapted to the work for which it is designed.

N is a box or trunk connecting the fanblower L with the smoke-stack D,said box N being provided with openings o o, that are controlled byslides p p, for the admission of fresh and cold air to mingle with thehot air and gases from the smoke-stack D.

O is a door swinging on the rod for closing the opening D in smoke-stackD, through which opening D' the unconsumed gases and smoke from theboiler-fires are drawn by the fan-blower L.

jp is adamperin the smoke-stack D,for regu- Iating the draft therein.

In operating the device a fire is built in the fire-place, the damper popened, and door O closed until steam enough is raised to run the fanand other auxiliary machinery. Then the fan L is put in motion, thedamper D and the doors of the ash-pit are closed, and the smoke-stackdoor 0 is partially or fully opened, and the unconsuined gases, smoke,and hot air from the {ire-place and smokestack are drawn through the boxI, where they mix with a proper supply of fresh air entering through theopenings o o and through the sleeve M into the fan-blower L, and thenceforced out through the outlet S and the box or chamber I into theash-pit E and up through the re on the grate, to secure the completecombustion of the fuel.

On steam ships and boats and many stationary boilers that are run dayand night means must be provided to remove the ashes from the ash-pitwhile the device is in operation. To accomplish this the partition F inthe ashpit E is turned up vertically to cut ott' connection between thetwo chambers E'" E". The damper or cut-off K in the chamber I is thenturned to prevent the smoke, gases, Sac., from the fan from entering theash-pit chamber E', while it permits their passage through thepassage-way H and into the chamber E" at d. The left-hand door, E', isthen opened and the ashes removed from the chamber E, the blast in thechamber E suiicing to keep up steam in the boiler during the removal ofthe ashes. The left-hand door, E', is then closed, the damper orcut-ofil K turned so as to open the passage to the chamber E and cut othe passage to chamber E", whence the ashes are then removed. Thepartition F is again turned horizontally, and the smoke, gases, and airnecessary to support combustion are supplied by the fan equallythroughout the ash-pit.

The fan L may be located at any convenient point on or about a boiler,whether the boiler be of the stationary, marine, or locomotive type.

It will be observed that in the combustion of fuel carbonic-acid gas isgenerated, which,

if returned to the fire, would put it out. One of the elements whichdestroys this gas is fresh air, a sufficient amountof which changes thispoisonous gas into a harmless one, which will support combustion, and,instead of cold air being supplied to the fires to retard the combustionof the fuel or to burn out the grate-bars, all the fresh air suppliedbecomes highly heated before it enters the ash-pit by mixture with thehot air, carbonic acid, and other products of combustion from thesmokestack; and it is found, by thus utilizing the waste heat from thestack,the smoke, and the carbonio acid, that a great economy of fuel isassured over the ordinary wasteful methods of applying fuel to boilers.

For the purpose of keeping the boiler-room cool where this device isapplied, I secure a cylinder, R, provided with openings in front of theboiler, as shown in the drawings, and force cold air therein through theattached pipe It by means of an auxiliary fan, so that the air issuingthrough the openings s s may keep the fronts of the boilers and aspaceabout them cool.

Having thus described my invention, I claim as new and desire to secureby Letters Pat` ent- 1. The combination, with a boiler fire-place, ofthe ash-pit E, provided with adjustable dividing-partition F, coveredpassage H, and bridge-wall H', provided with opening d, substantially asherein shown and described.

2. The combination, with the ash-pit E, of the connecting box orchamber-1, provided with cut-off K, substantially as herein shown anddescribed, whereby the blast into the ashpit is regulated. as set forth.

3. The combination, with the boiler A, of the smoke-stack D, providedwith door O and damper p, fanblower L, box N, provided with air-openings o o, connecting box or chamber I, and chambered ash-pit E,substantially as herein shown and described.

4. The combination, with the fan-blower L, of the air and gas mixing boxN, provided with air-openings o o, substantially as herein shown anddescribed.

5. The combination, with the boiler A, of the fan-blower L, constructedsubstantially as herein shown and described', consisting of acylindrical shell, shaft L", fan L, composed of sleeve M, spiders g g,circular end plate, M', lugs t' i, wings b b, and braces m m, as setforth.

6. In a boiler fan-blower designed for returning smoke and nncondensedgases from the smoke-stack to the boiler, the combination, with theshaft L, provided with outside bearings, f f, of the sleeve M and endplate, M', having spaces k la between them, and inclined wing-braces mm, substantially as herein shown and described.

CYRUS SMITH. Witnesses:

W. P. DEWALT, U. C. DEWALT.

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